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Articles by N. Jeyaraj
Total Records ( 3 ) for N. Jeyaraj
  N. Jeyaraj , Stebin Joseph , Arun , A. Suhaila , L. Divya and S. Ravikumar
  Zooplankton plays an important role in the marine food chain as intermediate link between phytoplankton and fish. Many of them are known to play important roles in marine ecosystems, including those in the food chain and matter transfer but there are also many species whose distribution and ecology are mostly unknown. The present study accounts deals with aspect of distribution and tidal influence of zooplankton from Estuarine regions along the Northern Kerala. The samples were taken in horizontal hauls using Hydro-Bios net (15 μm mesh size and 0.5 m mouth diameter) during high and low tide. The zooplankton community consisted of 65 species. Copepoda was the most important group both in term of species number and abundance. The species documented during low tide belong to groups with average percentage composition (%) such as calonoidia (25.37), cyclopodia (7.87), Harpacticoida (10.82), copepodites (18.11), foraminifera (1.99), ciliata (18.11), chaetognatha (2.88), cladocera (6.82), isopods (2.8) and larvae (13.28). While during high tide (%) groups include calonoidia (29.34), cyclopodia (4.69), Harpacticoida (4.38). The remaining groups viz., ctenophore, doliolids, siphonophores, isopods, ostracoda, cladocera, ctenophore, decapoda and fish eggs occurred sporadically and in small numbers. The highest abundance (1096 No. L-1) was observed during high tide from Azhlithala-Station 2, while the lowest (117 No. L-1) was detected during high tide from Chittari palam-Station 2. Both diversity and evenness was higher in Azhithala-Station 1 during high tide whereas the lowest diversity was observed during low tide from Chittari palam-Station 2 and no significant differences in dominance and total taxa of the studied area. The significant negative correlation obtained between the zooplankton density and evenness (-0.954) while positive correlation (0.993) obtained between diversity index and evenness. Further, multivariate analysis such as cluster analysis and PCA was engaged to correlate the zooplankton diversity. These analyses afford a superior significant in similarity and dissimilarity with in zooplankton community and studied sites.
  N. Jeyaraj , P. Santhanam , P. Raju , S. Ananth and K. Jothiraj
  Sustainable aquaculture depends upon eco-friendly, economically and socially viable culture systems. The recycling of organic wastes for plankton culture serves the dual purpose of cleaning the environment and providing economic benefits. There has been no experimentation to measure the effect of organic manure for the aquaculture of copepods, it may be reduced time and labor cost. Hence, the present experiment was conducted to evaluate the mass culture feasibility of Harpacticoid copepod, Macrosetella gracilis using a different organic manures viz., cow dung, poultry manure, goat manure and mixture of these three (1:1:1 ratio) at 500 g for each tank manures were decomposed for twelve days before the inoculation of copepod. Twenty adult copepod M. gracilis were inoculated. The peak density was found on 10-14th day of at all doses, among these four doses, significantly higher numbers of organisms 4213.33±213.48 ind. L-1 were found in the cow dung followed by the poultry manure, goat manure and mixed doses 2350.66±148.20; 1573.60±121.41; 995±102, respectively. The number of organisms was ground very low in mixed doses than other doses. Water quality analyses of culture system was no significantly different among the treatments especially pH and salinity. Cow dung manure is therefore recommended for quick and high production of copepod, M. gracilis which invariably reduces the high cost of expensive algae feed for copepod.
  N. Jeyaraj , M.R. Rajan and P. Santhanam
  The Common carp (Cyprinus carpio var. communis) is a potential culture species in fresh water ponds in India. However, growth of an industry around this species is constrained by poor survival during weaning from artificial diets. Hence, the present study was conducted to determine the dietary vitamin A requirement of Common carp (Cyprinus carpio var. communis) by formulating five different diets containing 0 (Control) 100, 200, 300 and 400 vitamin A. Each experimental diet was fed to triplicate groups of 10 fingerlings each with initial average weights of (1.48±0.26 g) maintained at 28±2°C for 30 days. The results revealed that feed consumption, protein consumption, feed conversion efficiency, protein efficiency ratio, growth, percentage growth, relative growth rate, Assimilation and metabolism was higher in feed IV containing 400 mg of vitamin A. Whereas higher gross growth efficiency and net growth efficiency recorded in feed II and feed I, respectively. The biochemical composition (%) such as moisture, protein and lipid of the fish significantly increased when the concentrations of vitamin A increased in the feeds. Interestingly, carbohydrate and ash content decreased with increasing concentrations vitamin A. Based on these results, it is recommended that the diet for fingerling Cyprinus carpio var. communis should contain vitamin A at a level of 400 mg for optimum growth, efficient feed utilization and profitability to farmers.
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